Practice Questions on Permutation-Combination
Aptitude Questions and Answers

Easy Permutation-Combination Question - 16

Q16.

$12$ chairs are arranged in a row and are numbered $1$ to $12$. $4$ men have to be seated in these chairs so that the chairs numbered $1$ ans$8$ should be occupied and no two men occupy adjacent chairs.

Find the number of ways the task can be done.

A.

$360$

B.

$384$

C.

$432$

D.

$470$

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Easy Permutation-Combination Question - 17

Q17.

How many words can be formed by re-arranging the letters of the word $ASCENT$ such that $A$ and $T$ occupy the first and last position respectively?

A.

$5!$

B.

$4!$

C.

$6! – 2!$

D.

$6!/2!$

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Easy Permutation-Combination Question - 18

Q18.

If ${^6P_r} = 360$ and ${^6C_r} = 15$ find $r$?

A.

$3$

B.

$4$

C.

$5$

D.

$6$

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Easy Permutation-Combination Question - 19

Q19.

In how many ways can six different rings be worn on four fingers of one hand?

A.

10

B.

12

C.

15

D.

16

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Easy Permutation-Combination Question - 20

Q20.

There are $12$ yes or no questions. How many ways can these be answered?

A.

$4096$

B.

$2048$

C.

$1024$

D.

$144$

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